Simple Hypothsis Testing Roadmap in Lean Six Sigma ...

I was teaching a Black Belt course in Washington, DC and i was asked to simplify the basic roadmap in a Hypothesis Test. In the example below, we are testing whether there is a correlation between two variables.
Example:

1. What is the practical question?
- Does an increase in tire pressure cause an increase in tread wear?

2. What is the X?
- Tire Pressure

3. What is the Y? (What am i measuring)
- Tread Wear

4. State the Null (Ho) and Alternative (Ha) Hypothesis
Note* in this example we are using Correlation: the Null Hypothesis is "r=0' (or there is no correlation)

- Null Hypothesis (Ho) = There is no relationship between tire pressure and tread wear
- Alt Hypothesis (Ha) = There is a relationship between tire pressure and tread wear

2. Gather data, Run the analysis and determine the P-Value

- Run a Corellation (the following metrics are an example of the outcome):
- r=.554, p-Value = .0228

3. Determine the Alpha Risk (100% - Confidence Interval)
- In this case the Confidence Interval was 95%, therefore the Alpha Risk is 5% (or 0.05)

5. What does the P-Value tell me ... (Reject or Accept the Null)
- Remember the saying: If P is low, then the "HO" must go! If P is high then keep the guy!
- (Remember that "P" is dependant on the Confidence Interval)

5. In this case we ....
- Reject the Null (because the P-Value (.0228) is lower than the Alpha Risk (0.05))

About Six Sigma Development Solutions, Inc.

We are Certified as an Accredited Training Organization with the International Association of Six Sigma Certification (IASSC)

“The IASSC Accredited Training Organization (ATO) designation validates Six Sigma Development Solutions, Inc. has demonstrated adequate management systems, courseware with a high degree of correlation to the subject matter contained in the IASSC Bodies of Knowledge, delivery schema consistent with such content and highly qualified instructors.”

We Provide Public Lean Six Sigma Lean Six Sigma Green Belt and Lean Six Sigma Black Belt Certification Training Courses in 34 Cities across the globe.

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We Provide Onsite Lean Six Sigma Certification Training. Some of the training's we provide are: Lean Six Sigma Black Belt, Lean Six Sigma Green Belt, Lean Six Sigma Yellow Belt, Lean Six Sigma Champions Training and Lean Certifications for Healthcare, Finance, I.T, Manufacturing, Processing, Logistics, Retail Sales and Government.

SSDSI will come to your site to train for your choice of the Lean Six Sigma Certification Levels. Onsite training is more cost effective than open enrollment training when training larger groups of team members.

Benefits of Onsite Training:

The Training is focused on Your Opportunities

SSDSI uses your opportunities in class (vs. generic examples)

You will get the experience of a seasoned Lean and Six Sigma Master Black Belt who will help mentor you while completing your Lean and Six Sigma Project

You can train up to 20 employees for one fixed cost (this cost includes courseware and the instructors travel & lodging)

Our courses are full of games, simulations, and active learning to help the adult learner

SSDSI can customize the training to meet your company’s particular training needs

For More Information Contact: Kevin Clay, MBB at 866-922-6566 or kclay@sixsigmadsi.com

Comments

  1. UnknownJune 25, 2012 at 12:55 PM

    I am not so sure that LSS has actually been successful in the business world. However, within DOD, it has been implemented with a heavy dose of bureaucracy, including numerous forms, reporting and rigid methodologies that require tollgate reviews that don't focus on advancing the goals of the project.
    But I believe that LSS is fundamentally flawed, because it places so much emphasis on listening to your customers prior to getting started with any meaningful improvement. Better to just focus on eliminating waste in the process, rather than fritter away effort on customer focus groups and surveys when they aren't going to add value.
    Often, we know what must be done to make improvements, then take months to perform an LSS event and dissipate all the energy and focus that could have gone to make improvements.

    ReplyDelete

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